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-rw-r--r--aoc2023/src/day9/solve.gleam1
1 files changed, 1 insertions, 0 deletions
diff --git a/aoc2023/src/day9/solve.gleam b/aoc2023/src/day9/solve.gleam
index ce061ae..a2cc7ae 100644
--- a/aoc2023/src/day9/solve.gleam
+++ b/aoc2023/src/day9/solve.gleam
@@ -35,6 +35,7 @@ fn extrapolate(ns: List(Int)) {
case is_constant(ns), ns {
True, [n, ..] -> n
False, [n, ..] -> n + extrapolate(take_derivative(ns))
+ _, _ -> panic as "list empty when it shouldn't be"
}
}